function controlPie(){
		var alto1 = document.body.clientHeight;
		var alto2 = document.documentElement.clientHeight;	
		//alert(alto1);
		//alert(alto2);
		var resto = (alto2 - alto1) + 76;
		
		if (alto1<alto2){
		document.getElementById('footer').style.height = resto + "px";
		}else{
			document.getElementById('footer').style.height ="76px";
			}
}